Stable solution of peroxid of hydrogen.



,tion.

*Unirian PATENT FFIQE.

STABLE SOLUTlUN QF PEROXED 0F HYDROGEN" no. ceases.

Specification of Letters Patent.

latented. July 10, 1906.

Application filed July 1'0. 1905. sol-a1 No. 269.083.

Be it known that l, \VALTER HEINRIoI, doctor of philosophy, a subject of the Prince of SchwarzburgSondershausen, residing at Markt 17 Halle-onthe--Saale, in the German Empire, have invented certain new and usefulimprovements'in Stable Solutions of Peroxid of Hydrogen, of which the following is a specificatimi.

The present invenl ion relates to stable so lutions of peroxid of hydrogen.

it is well known that diluted solutions of peroxid of hydrogen, especially watery solutions of the latter-e. g., solutions containing up to ten per cent. or more of said perc-Xid decompose in a comparatively short time. Therefore it has been proposed to add to such solutions special preserving means-"such alcohol, other, boric acid, (Ste. but these preserving means had not succeeded inpreserving the said solutions for a sulliciently long time. Also comparatively strong acids, as sulfiiric-acid, hydrochloric acid, acetic acid, or the like, have been proposed for the said purpose of preserving solutions of peroxid of hydrogen. Such preserving means have been successful relating to the preservin ac- These acids are, however, inconvenient for many purposes (such as for disinfecting or bleaching sensitive or delicate bodies or articles or parts tliereofe. g., for disinfecting the mouth or bleaching delicate ,iabrics, &c.,) of using solutions of peroxid of hydrogen containing said preserving acids.

, By experiences I have found that diluted solutions of peroxid of hydrogen (even containing no more than three per cent, of said peroxid) can be rendered stable for long timee. 9., for many monthsby the addition of comparatively small proportions of Such organic combinations, which can be considered as derivatives of ammonia. Such combinations are, first, acidyla'mids such as acetamid, benzamid; second, acidylimids, such as succinimid, phthaliniid; third, acidyl derivatives of aromatic bases, such as acetanilid, phenacetin, lactophenin, paratoluolp-triphenetidid; fourth, acidylderivatives of urea, such as the phenyl or benzyl derivatives of urea Inethyluracil. Such stable so lutions of peroxid of hydrogen form the subject-maltter of the present invention. A solution of peroxid of hydrogen-e. 9., con-- I taining three per cent. of said peroxid de composes, as it is known, at ordinary temperature so rapidly that after eight to fourteen days only about one-half the peroxid is found undecomposed. If, however, to the said solution a small proportion-e; g.,.severa-l graans or less for one liter of'the diluted solution of peroxid ofhydrogenfof these compounds-such as of benzamid, phthalimid, phenacetin, succinimid, laetophenin, &c. has been added, said solution is found to be practically permanent, as can be seen from the fact that even after several months a remarkable decrease of the amount of peroXid of hydrogen or a remarkable formation of any acid cannot-be established.

W hat I claim as my invention is Stable solution of peroxid of hydrogen containing a small proportion of an organic amido derivative substantially as and for the purpose set forth.

. In testimony whereof name to this specification in the two subscribing witnesses.

. WALTER HEINRIoI.

I have signed my Witnesses RUDOLPH FRICKF S. P. WARNER.

presence of 

